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Basic and cationic dyes

Basic Blue 6

Also known as Meldola, Naphthol blue, C.I. Basic Blue 6

CAS 966-62-1Formula C18H15ClN2OMolar mass 310.78 g/molEC 213-524-1
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Basic Blue 6 chemical structure, C18H15ClN2O, CAS 966-62-1
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
966-62-1
Formula
C18H15ClN2O
Molar mass
310.78 g/mol
EC number
213-524-1
HS code
320413
Category
Basic and cationic dyes

What is Basic Blue 6?

Plain description, key identifiers and synonyms

Basic Blue 6 is a chemical substance with the molecular formula C18H15ClN2O and a molar mass of 310.78 g/mol. Its CAS registry number is 966-62-1. The IUPAC name is benzo[a]phenoxazin-9-ylidene(dimethyl)azanium chloride.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
benzo[a]phenoxazin-9-ylidene(dimethyl)azanium chloride
CAS number
966-62-1 CAS number cross-checked
EC number
213-524-1
Molecular formula
C18H15ClN2O
UNII
CP2ST8ED1O
INCI name
BASIC BLUE 6
InChIKey
HWYNRVXFYFQSID-UHFFFAOYSA-M
InChI
InChI=1S/C18H15N2O.ClH/c1-20(2)13-8-9-15-17(11-13)21-16-10-7-12-5-3-4-6-14(12)18(16)19-15;/h3-11H,1-2H3;1H/q+1;/p-1
SMILES (canonical and isomeric)
C[N+](=C1C=CC2=NC3=C(C=CC4=CC=CC=C43)OC2=C1)C.[Cl-]

Synonyms

  • Meldola
  • Naphthol blue
  • C.I. Basic Blue 6
  • Naphthol blue (VAN)
  • C.I. Basic Blue 6 (VAN)
  • C.I. 51175
  • CI 51175
  • Benzo(a)phenazoxonium, 9-(dimethylamino)-, chloride
  • Benzo(a)phenoxazinium, 9-(dimethylamino)-, chloride
  • Benzo[a]phenoxazin-7-ium, 9-(dimethylamino)-, chloride
  • Benzo(a)phenoxazin-7-ium, 9-(dimethylamino)-, chloride (1:1)
  • 9-Dimethylaminobenzo(a)phenazoxonium chloride
  • 9-(Dimethylamino)benzo(a)phenoxazinium chloride
  • 9-(Dimethylamino)benzo(alpha)phenoxazin-7-ium chloride
  • Benzo(a)phenoxazin-7-ium, 9-(dimethylamino)-, chloride
  • Benzo(alpha)phenoxazin-7-ium,9-(dimethylamino)-, chloride
  • Benzo[a]phenoxazin-7-ium, 9-(dimethylamino)-, chloride (1:1)
  • Meldola's blue
  • Phenylene Blue
  • 9-(dimethylamino)benzo[a]phenoxazin-7-ium chloride
  • benzo[a]phenoxazin-9-ylidene(dimethyl)azanium, chloride
  • 9-(Dimethylamino)benzo(a)phenazin-7-ium chloride, compound with zinc chloride
  • 9-(Dimethylamino)benzo(a)phenoxazin-7-ium chloride
  • benzo[a]phenoxazin-9-ylidenedimethylamine, chloride
  • 8-Dimethylamino-2,3-benzophenoxazine
Show all 29 synonyms
  • 9-(Dimethylamino)benzo[a]phenoxazin-7-ium Chloride Zinc Chloride, Meldola's Blue,
  • Benzo[a]phenoxazinium, chloride
  • N,N-dimethylbenzo[a]phenoxazin-7-ium-9-amine
  • benzo[a]phenoxazin-9-ylidene(dimethyl)ammonium, chloride

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

No measured properties are recorded for this substance yet. Ask suppliers for a technical data sheet.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
310.78 g/molcalc.
Exact mass
310.0873 Dacalc.
LogP (octanol/water)
0.12calc.
Topological polar surface area
29.04 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
2calc.
Rotatable bonds
0calc.
Heavy atoms
22calc.
Rings
4calc.
Aromatic rings
2calc.
Fraction sp3 carbons
0.11calc.
Formal charge
0calc.
Stereocentres
0calc.
Components
2calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Murcko scaffold

The ring system that remains when every side chain is removed

Murcko scaffold of this chemical, [N+]=c1ccc2nc3c(ccc4ccccc43)oc-2c1

[N+]=c1ccc2nc3c(ccc4ccccc43)oc-2c1

4 rings, 19 atoms.

18 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

No GHS hazard classification is recorded for this substance yet. That does not mean it is harmless.

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Basic Blue 6 suppliers

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Basic Blue 6 price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Use classes: Cosmetics.

Cosmetic ingredient, INCI name BASIC BLUE 6(hair dyeing)

Functional uses

  • Dye

Cosmetic functions

  • Hair dyeing

Regulatory status

Inventories, regulations and trade controls that list this substance

Health and food

  • EU cosmetic ingredient inventory

United States

  • TSCA inventory (USA)
    Status: Inactive in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Basic Blue 6 is traded under.

HS 3204.13Indicative HS code

Basic dyes and preparations based thereon

World exports in 2024
$209M
−2.6% vs 2023, imports $224M
2019 to 2024
Top exporters
  1. India * partner reported27.9%
  2. China21.8%
  3. Spain6.6%
Top importers
  1. United States11.2%
  2. China7.9%
  3. Germany7.4%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

The HS code shown for Basic Blue 6 is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Basic Blue 6, based on the data on this page

What is Basic Blue 6?

Basic Blue 6 is a chemical substance with the molecular formula C18H15ClN2O and a molar mass of 310.78 g/mol. Its CAS registry number is 966-62-1. The IUPAC name is benzo[a]phenoxazin-9-ylidene(dimethyl)azanium chloride.

What is the CAS number of Basic Blue 6?

The CAS registry number of Basic Blue 6 is 966-62-1.

What is the molecular formula and weight of Basic Blue 6?

The molecular formula of Basic Blue 6 is C18H15ClN2O and its molar mass is 310.78 g/mol.

What is Basic Blue 6 used for?

Use classes: Cosmetics.

Is Basic Blue 6 hazardous?

No GHS hazard classification for Basic Blue 6 is recorded on CompoundList yet. That does not prove it is safe. Always read the supplier safety data sheet.

What is the HS code of Basic Blue 6?

Basic Blue 6 is usually classified under HS code 320413 (Basic dyes and preparations based thereon). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Basic Blue 6?

Post a free request on CompoundList and suppliers of Basic Blue 6 will send you quotes. Your contact details stay private until you accept a quote.

What is the price of Basic Blue 6?

Suppliers quote Basic Blue 6 on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Basic Blue 6

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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